Engine Runs Rough at Idle

Car Trouble Symptom
Rough idle while car engine is running is an indication of engine misfiring on one or more cylinders, when the engine misfire this can cause unbalance to car engine which then causes rough idle.

Car Problem Diagnosis
The real problem here is that, why the car engine misfire? Engine misfiring can cause by a lot of factors and it is very difficult to test. However, there are only two common reasons that usually causing the problem, first is a vacuum leak and the second is a bad spark plugs or spark plug wires.
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